1. Finite-Difference Methods for Partial Differential Equations;Forsythe,1960
2. An asymmetrical finite difference network;MacNeal;Appl. Math.,1953
3. Flexible finite-difference stencils from isoparametric finite elements;Frey;Int. J. Numer. Meth. Eng.,1978
4. Finite difference technique for variable grids;Jensen;Comput. Struct.,1972
5. A general finite difference method for arbitrary meshes;Perrone;Comput. Struct.,1975